Practical current source: In real-world circuits, a current source cannot be ideal; it always has a finite internal resistance (typically large but not infinite). State whether this statement is true or false.

Introduction / Context:
A current source is a two-terminal element intended to deliver a specified current regardless of the load. Ideal sources are useful abstractions, but every physical implementation deviates from ideal behavior. This question tests understanding of the difference between ideal and practical current sources and the role of internal resistance (compliance).

Given Data / Assumptions:

• The device is a practical (real) current source, not an ideal model.
• It must operate over a finite compliance voltage range.
• Internal elements can be represented by an equivalent resistance in parallel with the current source (Norton form).

Concept / Approach:

In Norton representation, a practical current source is modeled as an ideal current source in parallel with a finite internal resistance Rint. A very large Rint makes the source closer to ideal, but it can never be infinite in practice. This resistance limits how perfectly the source holds current as load voltage varies and defines the compliance range where the source behaves approximately constant-current.

Step-by-Step Solution:

Verification / Alternative check:

Measure current into two different load resistances. If the source were ideal (infinite internal resistance), current would be identical. Any measurable change indicates finite internal resistance and confirms practicality.

Why Other Options Are Wrong:

• “False” implies infinite internal resistance is achievable in real hardware, which contradicts device physics and component limitations.

Common Pitfalls:

Confusing series vs. parallel placement in models: practical current sources use a parallel internal resistance (Norton), whereas practical voltage sources use a series internal resistance (Thevenin). Also, mixing up high but finite with truly infinite resistance.

Final Answer:

True